The basic economic problem is that we have unlimited wants but limited resources to satisfy them. This creates scarcity, which forces us to make choices about how to allocate our resources.

The three main economic goals of a society are economic growth, full employment, and price stability. Economic growth refers to the increase in the value of goods and services produced in an economy over time. Full employment refers to the situation in which all those who are willing and able to work can find a job. Price stability refers to the situation in which the general level of prices in an economy remains relatively constant over time.

Microeconomics studies the behavior of individual economic agents, such as households and firms, and how they interact with each other in markets. Macroeconomics studies the behavior of the economy as a whole, including the overall level of output, employment, and inflation. Microeconomics and macroeconomics are closely related, and they both contribute to our understanding of how the economy works.

The law of supply and demand is a fundamental principle of economics that explains how the prices of goods and services are determined. The law states that the quantity of a good or service supplied is directly related to its price, and the quantity of a good or service demanded is inversely related to its price. This means that as the price of a good or service increases, the quantity supplied will increase and the quantity demanded will decrease. Conversely, as the price of a good or service decreases, the quantity supplied will decrease and the quantity demanded will increase.

Marginal utility is the additional satisfaction that a consumer gets from consuming one more unit of a good or service. It is a key concept in economics because it helps to explain why consumers are willing to pay different prices for different goods and services. The marginal utility of a good or service is typically highest when the consumer has a strong desire for it and lowest when the consumer has a weak desire for it.

Opportunity cost is the value of the next best alternative that is given up when a decision is made. It is a key concept in economics because it helps to explain why people make the choices that they do. For example, if a student decides to go to college, the opportunity cost of that decision is the income that the student could have earned if they had instead gone to work. The opportunity cost of a decision can be either explicit or implicit. Explicit opportunity costs are costs that are directly incurred, such as the tuition and fees that a student pays to attend college. Implicit opportunity costs are costs that are not directly incurred, such as the income that a student could have earned if they had instead gone to work.

Externalities are the positive or negative effects that a person's actions have on others. Externalities can be either positive or negative. Positive externalities occur when a person's actions benefit others, such as when a person donates to charity or volunteers their time to help others. Negative externalities occur when a person's actions harm others, such as when a person pollutes the environment or creates noise pollution.

Market failure occurs when the market is unable to allocate resources efficiently, produce enough goods and services, or distribute goods and services fairly. Market failure can be caused by a variety of factors, such as monopolies, externalities, and information asymmetry. When market failure occurs, the government may intervene to correct the market failure and improve the efficiency of the economy.

Economic growth is the increase in the value of goods and services produced in an economy over time. It is typically measured by the growth rate of real gross domestic product (GDP). Economic growth can be caused by a variety of factors, such as technological progress, capital accumulation, and labor force growth. Economic growth is generally considered to be a good thing because it leads to higher living standards for people.

Inflation is the sustained increase in the general level of prices in an economy over time. It is typically measured by the consumer price index (CPI) or the producer price index (PPI). Inflation can be caused by a variety of factors, such as an increase in the money supply, an increase in demand, or a decrease in supply. Inflation can have a negative impact on the economy by reducing the purchasing power of consumers and businesses.

Unemployment is the situation in which people who are willing and able to work cannot find a job. Unemployment can be caused by a variety of factors, such as a recession, a structural change in the economy, or a mismatch between the skills of workers and the jobs that are available. Unemployment can have a negative impact on the economy by reducing the output of goods and services and by increasing the poverty rate.

Fiscal policy is the use of government spending and taxation to influence the economy. Fiscal policy can be used to stimulate the economy during a recession or to slow down the economy during a period of high inflation. Fiscal policy can also be used to redistribute income from the rich to the poor. Fiscal policy is typically implemented by the government through the budget process.

Monetary policy is the use of central bank interest rates and other tools to influence the economy. Monetary policy can be used to stimulate the economy during a recession or to slow down the economy during a period of high inflation. Monetary policy can also be used to stabilize the financial system. Monetary policy is typically implemented by the central bank through open market operations, changes in reserve requirements, and changes in the discount rate.

International trade is the exchange of goods and services between countries. International trade can take place between two countries or between many countries. International trade can be beneficial to countries because it allows them to specialize in the production of goods and services that they have a comparative advantage in producing. International trade can also lead to lower prices for consumers and higher incomes for producers.

Economic development is the process by which a country's economy grows and improves. Economic development can be measured by a variety of indicators, such as GDP per capita, life expectancy, and literacy rate. Economic development can be caused by a variety of factors, such as technological progress, capital accumulation, and labor force growth. Economic development is generally considered to be a good thing because it leads to higher living standards for people.